Crossword Genius

Legally invalid (4)

Ross

I believe the answer is:

null

'legally invalid' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for null that I've seen before include "Without value or consequence" , "Having the value zero -- void" , "Of no effect, value" , "Non-existent and void" , "Legally void" .)

I've seen this clue in The Times.
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